Issue a fatal error on bad fwrite return

* dwp.cc (Dwo_file::record_target_info): Issue a fatal error
	on bad fwrite return.

gold/ChangeLog

@@ -1,3 +1,8 @@
+2012-10-25  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* dwp.cc (Dwo_file::record_target_info): Issue a fatal error
+	on bad fwrite return.
+
 2012-10-25  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* dwp.cc (Dwo_file::remap_str_offset): Use section_offset_type

gold/dwp.cc

@@ -1458,7 +1458,9 @@ Dwp_output_file::record_target_info(const char*, int machine,
   // Write zeroes for the ELF header initially.  We'll write
   // the actual header during finalize().
   static const char buf[elfcpp::Elf_sizes<64>::ehdr_size] = { 0 };
-  ::fwrite(buf, 1, this->next_file_offset_, this->fd_);
+  if (::fwrite(buf, 1, this->next_file_offset_, this->fd_)
+      < (size_t) this->next_file_offset_)
+    gold_fatal(_("%s: %s"), this->name_, strerror(errno));
 }
 
 // Add a string to the debug strings section.